Year	Number of
1990	466.05
1991	481.52
1992	500.07
1993	528.48
1994	560.08
1995	588.79
1996	613.9
1997	637.36
1998	668.95
1999	704.99
2000	742.67
2001	777.86
2002	813.43
2003	846.1
2004	877.74
2005	902.43
2006	918.66
2007	935.67
2008	957.48
2009	986.05
2010	1022.88
2011	1045.89
2012	1070.58
2013	1096.04
2014	1124.8
2015	1156.76
2016	1183.91